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　　"""OCR in Python using the Tesseract engine from Google

　　http://code.google.com/p/pytesser/

　　by Michael J.T. O'Kelly

　　V 0.0.1, 3/10/07"""

　　import Image

　　import subprocess

　　import util

　　import errors

　　tesseract_exe_name = 'tesseract' # Name of executable to be called at command line

　　scratch_image_name = "temp.bmp" # This file must be .bmp or other Tesseract-compatible format

　　scratch_text_name_root = "temp" # Leave out the .txt extension

　　cleanup_scratch_flag = True # Temporary files cleaned up after OCR operation

　　def call_tesseract(input_filename, output_filename, language):

　　"""Calls external tesseract.exe on input file (restrictions on types),

　　outputting output_filename+'txt'"""

　　args = [tesseract_exe_name, input_filename, output_filename, "-l", language]

　　proc = subprocess.Popen(args)

　　retcode = proc.wait()

　　if retcode!=0:

　　errors.check_for_errors()

　　def image_to_string(im, cleanup = cleanup_scratch_flag, language = "eng"):

　　"""Converts im to file, applies tesseract, and fetches resulting text.

　　If cleanup=True, delete scratch files after operation."""

　　try:

　　util.image_to_scratch(im, scratch_image_name)

　　call_tesseract(scratch_image_name, scratch_text_name_root,language)

　　text = util.retrieve_text(scratch_text_name_root)

　　finally:

　　if cleanup:

　　util.perform_cleanup(scratch_image_name, scratch_text_name_root)

　　return text

　　def image_file_to_string(filename, cleanup = cleanup_scratch_flag, graceful_errors=True, language = "eng"):

　　"""Applies tesseract to filename; or, if image is incompatible and graceful_errors=True,

　　converts to compatible format and then applies tesseract. Fetches resulting text.

　　If cleanup=True, delete scratch files after operation."""

　　try:

　　try:

　　call_tesseract(filename, scratch_text_name_root, language)

　　text = util.retrieve_text(scratch_text_name_root)

　　except errors.Tesser_General_Exception:

　　if graceful_errors:

　　im = Image.open(filename)

　　text = image_to_string(im, cleanup)

　　else:

　　raise

　　finally:

　　if cleanup:

　　util.perform_cleanup(scratch_image_name, scratch_text_name_root)

　　return text

　　if __name__=='__main__':

　　im = Image.open('phototest.tif')

　　text = image_to_string(im)

　　print text

　　try:

　　text = image_file_to_string('fnord.tif', graceful_errors=False)

　　except errors.Tesser_General_Exception, value:

　　print "fnord.tif is incompatible filetype. Try graceful_errors=True"

　　print value

　　text = image_file_to_string('fnord.tif', graceful_errors=True)

　　print "fnord.tif contents:", text

　　text = image_file_to_string('fonts_test.png', graceful_errors=True)

　　print text